1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 * 29 * @(#)xdr_reference.c 1.11 87/08/11 SMI 30 * @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC 31 * $FreeBSD: src/lib/libc/xdr/xdr_reference.c,v 1.8 1999/08/28 00:02:56 peter Exp $ 32 * $DragonFly: src/lib/libc/xdr/xdr_reference.c,v 1.4 2005/12/05 00:47:57 swildner Exp $ 33 */ 34 35 /* 36 * xdr_reference.c, Generic XDR routines impelmentation. 37 * 38 * Copyright (C) 1987, Sun Microsystems, Inc. 39 * 40 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 41 * "pointers". See xdr.h for more info on the interface to xdr. 42 */ 43 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <rpc/types.h> 48 #include <rpc/xdr.h> 49 50 #define LASTUNSIGNED ((u_int) 0-1) 51 52 /* 53 * XDR an indirect pointer 54 * xdr_reference is for recursively translating a structure that is 55 * referenced by a pointer inside the structure that is currently being 56 * translated. pp references a pointer to storage. If *pp is null 57 * the necessary storage is allocated. 58 * size is the sizeof the referneced structure. 59 * proc is the routine to handle the referenced structure. 60 * 61 * Parameters: 62 * pp: the pointer to work on 63 * size: size of the object pointed to 64 * proc: xdr routine to handle the object 65 */ 66 bool_t 67 xdr_reference(XDR *xdrs, caddr_t *pp, u_int size, xdrproc_t proc) 68 { 69 caddr_t loc = *pp; 70 bool_t stat; 71 72 if (loc == NULL) 73 switch (xdrs->x_op) { 74 case XDR_FREE: 75 return (TRUE); 76 77 case XDR_DECODE: 78 *pp = loc = (caddr_t) mem_alloc(size); 79 if (loc == NULL) { 80 fprintf(stderr, 81 "xdr_reference: out of memory\n"); 82 return (FALSE); 83 } 84 memset(loc, 0, (int)size); 85 break; 86 case XDR_ENCODE: 87 break; 88 } 89 90 stat = (*proc)(xdrs, loc, LASTUNSIGNED); 91 92 if (xdrs->x_op == XDR_FREE) { 93 mem_free(loc, size); 94 *pp = NULL; 95 } 96 return (stat); 97 } 98 99 100 /* 101 * xdr_pointer(): 102 * 103 * XDR a pointer to a possibly recursive data structure. This 104 * differs with xdr_reference in that it can serialize/deserialiaze 105 * trees correctly. 106 * 107 * What's sent is actually a union: 108 * 109 * union object_pointer switch (boolean b) { 110 * case TRUE: object_data data; 111 * case FALSE: void nothing; 112 * } 113 * 114 * > objpp: Pointer to the pointer to the object. 115 * > obj_size: size of the object. 116 * > xdr_obj: routine to XDR an object. 117 * 118 */ 119 bool_t 120 xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj) 121 { 122 bool_t more_data; 123 124 more_data = (*objpp != NULL); 125 if (! xdr_bool(xdrs,&more_data)) { 126 return (FALSE); 127 } 128 if (! more_data) { 129 *objpp = NULL; 130 return (TRUE); 131 } 132 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); 133 } 134